Yes, you have some problems, there. Who told you it was a circle? It's not necessarily invalid, unless it's supposed to be a circle. Where did you get it and what was the original problem statement?
this is not a circle (unless you made an error), since we could not have a negative number on the right hand side if it were a circle.
unless maybe the circle has a radius in the complex plane, but i don't think that makes sense, never did complex analysis
Here was the original problem statement: CLICK HERE
Probably will, 'cause it's really counterproductive a circle with a negative radius :eek: